Lady GaGa climbs to top of Hot 100

Beyonce lands at No. 2; T.I. comes in third

NEW YORK -- Lady GaGa ascends from No. 2 to No. 1 on the Billboard Hot 100 this week with "Just Dance," which sold 279,000 downloads in the U.S., according to Nielsen SoundScan. At 22 weeks, the song makes the longest trip to the top since Creed's "With Arms Wide Open" (27 weeks) in November 2000.

For the first time since Jan. 17, 1998, the Hot 100 does not have a debut; the only additions to the list this week are re-entries. Last week's No. 1, Beyonce's "Single Ladies (Put a Ring on It)," drops to No. 2, while T.I.'s "Live Your Life" featuring Rihanna holds at No. 3.

On Hot R&B/Hip-Hop Songs, "Single Ladies" is No. 1 for an eighth week, while Sugarland assumes control on Hot Country Songs with "Already Gone," which flip-flops from No. 2 to No. 1 with Rascal Flatts' "Here."

There's no change on Billboard's rock charts, with Kings of Leon's "Sex on Fire" starting a fifth week atop Modern Rock and Shinedown leading Mainstream Rock for a fourth with "Second Chance."